NEET UG Modern Physics & Electronics: Dual Nature of Radiation and Matter – Chapter Test

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Difficulty: 7 medium · 13 hard

Dual Nature of Radiation and Matter MCQ questions with answers

The first 3 of 20 questions. Unlock the series for the rest, each with a solution.

1. Q1. The wave nature of electrons was independently demonstrated by diffracting an electron beam while transmitting it through thin metal foils. This demonstration is credited to:

   इलेक्ट्रॉनों की तरंग प्रकृति को एक इलेक्ट्रॉन पुंज को पतली धातु पन्नियों में से पारगमित करते हुए विवर्तित करके स्वतंत्र रूप से प्रदर्शित किया गया। यह प्रदर्शन किसे श्रेय दिया जाता है:

   • A. J. J. Thomson / जे. जे. थॉमसन
   • B. Clinton Davisson / क्लिंटन डेविसन
   • C. Louis de Broglie / लुई दे ब्रॉग्ली
   • D. G. P. Thomson / जी. पी. थॉमसन
   Solution

   G. P. Thomson showed electron diffraction using thin metal foils, around the same time as the Davisson–Germer crystal-reflection experiment.

   जी. पी. थॉमसन ने पतली धातु पन्नियों का उपयोग करके इलेक्ट्रॉन विवर्तन दिखाया, जो लगभग उसी समय के आसपास हुआ जब डेविसन–जर्मर का क्रिस्टल-परावर्तन प्रयोग हुआ।

2. Q2. The linear momentum of a photon of wavelength 500 nm is approximately (take h = 6.63 × 10⁻³⁴ J·s):

   500 nm तरंगदैर्घ्य वाले एक फोटॉन का रैखिक संवेग लगभग है (h = 6.63 × 10⁻³⁴ J·s लीजिए):

   • A. 1.33 × 10⁻²⁷ kg·m/s
   • B. 1.33 × 10⁻²⁹ kg·m/s
   • C. 6.63 × 10⁻²⁷ kg·m/s
   • D. 3.98 × 10⁻²⁶ kg·m/s
   Solution

   p = h/λ = (6.63 × 10⁻³⁴)/(500 × 10⁻⁹) ≈ 1.33 × 10⁻²⁷ kg·m/s.

   p = h/λ = (6.63 × 10⁻³⁴)/(500 × 10⁻⁹) ≈ 1.33 × 10⁻²⁷ kg·m/s।

3. Q3. The threshold wavelength of a metal is 310 nm. Taking hc = 1240 eV·nm, the work function of the metal is approximately:

   किसी धातु की देहली तरंगदैर्घ्य 310 nm है। hc = 1240 eV·nm लेने पर, धातु का कार्यफलन लगभग है:

   • A. 4.0 eV
   • B. 2.0 eV
   • C. 3.1 eV
   • D. 6.2 eV
   Solution

   Work function W = hc/λ₀ = 1240 eV·nm / 310 nm = 4.0 eV.

   कार्यफलन W = hc/λ₀ = 1240 eV·nm / 310 nm = 4.0 eV।

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